public class Circle extends Shape{

    private double radius;

    public Circle(double radius) {
        this.radius = radius;
    }

    public Circle() {
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    @Override
    public String toString() {
        return "Circle{radius = " + radius + "}";
    }

    @Override
    double getArea() {

        return Math.PI * radius * radius;

    }

    @Override
    double getCircumference() {
return
        2 * Math.PI * radius;
    }
}
